[OSGeo-Discuss] Built a mask

[Elena Bastianon]

Hello,
What I must do is create a mask in GRASS which takes consideration on the
slope of the study area.
I'm studying a river and I have the GDEM of the area, what I've done so far
it was extrapolate some sections in order to have the longitudinal profile
/ slope (and that is a line), to do that I used the GDEM, following the
main channel line's.
Now my problem  is how to transform this informations in a surface.
My idea would be to create something like a GDEM from the longitudinal
profile (I tried with v.surf.rast) and then with r.mapcalc get the mask
(with r.mapcalc, define the mask choosing the points of the GDEM which are
located at an altitude of about 5-6m larger than that of the longitudinal
profile).

Does anyone have any suggestions?

Thanks in advance for availability
Have a nice day

-- 
Elena
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